Spurred by Kelly Clarkson's recent comments that she has been unable to find a suitable duet partner, Jimmy Fallon offered his services on last night's The Tonight Show. Together, the couple sang a dozen duets in a four-minute mega-medley. Much like Fallon's ongoing History of Rap series with Justin Timberlake, the late-night host and the "Heartbeat Song" singer take a similar journey through five decades of chart-topping duets, kicking things off with Sonny and Cher's "I Got You Babe" before bringing it on home with Lionel Richie and Diana Ross' "Endless Love."

The comment Fallon is referring to at the beginning of the bit is based on something Clarkson recently told BBC Radio 1 regarding the lack of guests on her new album Piece by Piece. "I honestly would collaborate with a lot of people, but everyone usually says no," she said. "I'm not kidding you. I have legitimately asked several people that I'm not going to call out, and that's cool, but I don't know." The singer later tweeted that she was just joking about not being able to find duet partners, and that John Legend would feature on her Piece by Piece track "Run Run Run."